Keolis, the company that runs the commuter rail line, issued a statement calling the situation a “medical emergency.”

“We are working with authorities to support this investigation. Trains are able to proceed through the area, although delays are expected this morning as a result of this incident,” said Keolis spokesman Tory Mazzola.

“We are working with police and emergency officials as quickly as possible to help minimize the impact on passenger service, and we encourage Worcester Line riders to stay connected with the Keolis passenger information center to receive updates on specific trains.”